Why can't my phone call/text certain people with iPhones?

For several months I've had to use a POS iPhone 3 as my cell. A couple weeks ago I couldn't call or text my dad, he could call and text me though. But within a few days we couldn't contact each other at all.
Now I have a new android but now I can't contact my dad (he can text/call me though) and now I can't even text my best friend.

What the hell is wrong here? This is seriously pissing me off. The people at AT&T said I had to turn off iMessaging on the old iPhone 3 but it doesn't even have that. I can't even get past restrictions on that garbage.

It's driving me insane. I need to be able to text people. If you have an answer please elaborate the steps but keep it short and simple. Please I'm at the point where I just want to throw this crap iPhone to the ground and smash it with a hammer.

Maybe its them and not you.

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